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Financial Income and Expenses - Summary of Financial Income and Expenses (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about finance income expense [line items] |  |  |
Contractual interest on ﬁnancial assets | kr 2,515 | kr 1,897 | kr 717
Net revaluation gains and losses on financial assets | 137 | 64 | (146)
Financial income | 2,734 | 2,145 | 778
Net revaluation gains and losses on financial liabilities | 82 | (134) | 379
Net interest on pension liabilities | (647) | (517) | (361)
Financial expenses | (4,103) | (4,118) | (1,930)
Net foreign exchange gains/losses | (355) | (1,020) | (1,259)
Financial income and expenses, net | (1,724) | (2,993) | (2,411)
Financial instruments at fair value through profit or loss | 289 | 885 | (2,552)
Financial liabilities designated at fair value through profit or loss | (378) | (1,100) | 2,847
Financial assets at amortized cost [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial income | 538 | 403 | 251
Contractual interest on financial liabilities [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (2,486) | (2,282) | (972)
Contractual interest on financial liabilities at amortized cost [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (277) | (501) | (128)
Lease interest expense [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (421) | (464) | (464)
Other financial income (expenses) [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial income | 82 | 184 | 207
Financial expenses | kr (631) | kr (721) | kr (512)

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